not a happy bunny
not a happy bunnyBRITISH, INFORMAL
If you say that someone is not a happy bunny, you mean that they are annoyed or unhappy about something. I am receiving around 1,000 virus emails a day. I am not a happy bunny. Note: This expression is used humorously. Note: `Bunny' is a childish word for a rabbit, and the expression is meant to sound like part of a children's story.